Cause of and method to avoid 「com.kapowtech.lang.ApplicationError: Could not convert Excel document to bytes.」

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• When I try to open a robot on DS after directly editing its .robot file on the editor, a "Could not open file" error occurs, impeding the robot from opening, and the original state from being reachable again
• I tried to open a web page that uses iframe but an error stopped me. What is the cause and how can can solve this?
• This internal error occurred in DS: 「xxx.XMLBrowserDocument cannot be cast to xxx.html.HTMLBrowserDocument」. Can I know the cause and a method to solve it?
• Cause of and method to avoid 「com.kapowtech.lang.ApplicationError: Could not convert Excel document to bytes.」
• On DS, after opening an Excel file with characters written in column AA and/or after, an Internal error occurs if you display another Excel file with a View as Excel step of another branch